/**
 * The utillib library.
 * More information is available at http://www.jinchess.com/.
 * Copyright (C) 2002 Alexander Maryanovsky.
 * All rights reserved.
 *
 * The utillib library is free software; you can redistribute
 * it and/or modify it under the terms of the GNU Lesser General Public License
 * as published by the Free Software Foundation; either version 2 of the
 * License, or (at your option) any later version.
 *
 * The utillib library is distributed in the hope that it will
 * be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser
 * General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with utillib library; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

package free.util;

import java.io.InputStream;
import java.io.IOException;


/**
 * An alternative implementation of PipedInputStream. Note that this is just
 * a wrapper, the real action happens in PipedStreams.
 */

class PipedInputStream extends InputStream {


    /**
     * The PipedStreams object we get the data from.
     */

    private final PipedStreams source;


    /**
     * Creates a new PipedInputStream which reads data from the given
     * PipedStreams object.
     */

    public PipedInputStream(PipedStreams source) {
        this.source = source;
    }


    /**
     * Returns the amount of bytes it's possible to read from this PipedInputStream
     * without blocking.
     */

    public int available() {
        return source.available();
    }


    /**
     * Reads the next byte of data from this input stream. The value byte is
     * returned as an int in the range 0 to 255. If no byte is available because
     * the end of the stream has been reached, the value -1 is returned. This
     * method blocks until input data is available, the end of the stream is
     * detected, or an exception is thrown.
     */

    public int read() throws IOException {
        return source.read();
    }


    /**
     * Reads up to length bytes of data from this input stream into an array of bytes.
     * This method blocks until some input is available. If the argument b is null,
     * a NullPointerException is thrown.
     */

    public int read(byte[] buf, int offset, int length) throws IOException {
        return source.read(buf, offset, length);
    }


    /**
     * Closes this PipedInputStream.
     */

    public void close() throws IOException {
        source.closeReader();
    }


}
